<h4>Tool</h4><table border="0"><tr><td valign="top"><b>Name</b></td><td valign="top">Relative Heights and Slope Positions</td></tr><tr><td valign="top"><b>ID</b></td><td valign="top">14</td></tr><tr><td valign="top"><b>Author</b></td><td valign="top">J.Boehner, O.Conrad (c) 2008</td></tr><tr><td valign="top"><b>Specification</b></td><td valign="top">grid</td></tr></table><hr><h4>Description</h4>The tool allows one to calculate several terrain indices from a digital elevation model.

General information on the computational concept can be found in:
- Boehner, J. and Selige, T. (2006): Spatial prediction of soil attributes using terrain analysis and climate regionalisation. In: Boehner, J., McCloy, K.R., Strobl, J. [Ed.]: SAGA - Analysis and Modelling Applications, Goettinger Geographische Abhandlungen, Goettingen: 13-28. (<a target="_blank" href="http://downloads.sourceforge.net/saga-gis/gga115_02.pdf">pdf</a>)

<hr><h4>Parameters</h4><table border="1" width="100%" valign="top" cellpadding="5" rules="all"><tr><th>Name</th><th>Type</th><th>Identifier</th><th>Description</th><th>Constraints</th></tr>
<tr><th colspan="5">Input</th></tr><tr><td>Elevation </td><td>Grid (input)</td><td>DEM</td><td></td><td></td></tr><tr><th colspan="5">Output</th></tr><tr><td>Slope Height</td><td>Grid (output)</td><td>HO</td><td></td><td></td></tr><tr><td>Valley Depth</td><td>Grid (output)</td><td>HU</td><td></td><td></td></tr><tr><td>Normalized Height</td><td>Grid (output)</td><td>NH</td><td></td><td></td></tr><tr><td>Standardized Height</td><td>Grid (output)</td><td>SH</td><td></td><td></td></tr><tr><td>Mid-Slope Positon</td><td>Grid (output)</td><td>MS</td><td></td><td></td></tr><tr><th colspan="5">Options</th></tr><tr><td>w</td><td>Floating point</td><td>W</td><td>The parameter weights the influence of catchment size on relative elevation (inversely proportional).</td><td>Minimum: 0.000000
Default: 0.500000</td></tr><tr><td>t</td><td>Floating point</td><td>T</td><td>The parameter controls the amount by which a maximum in the neighbourhood of a cell is taken over into the cell (considering the local slope between the cells). The smaller 't' and/or the smaller the slope, the more of the maximum value is taken over into the cell. This results in a greater generalization/smoothing of the result. The greater 't' and/or the higher the slope, the less is taken over into the cell and the result will show a more irregular pattern caused by small changes in elevation between the cells.</td><td>Minimum: 0.000000
Default: 10.000000</td></tr><tr><td>e</td><td>Floating point</td><td>E</td><td>The parameter controls the position of relative height maxima as a function of slope.</td><td>Minimum: 0.000000
Default: 2.000000</td></tr></table>